|Accelerating Ice Sheet - NASA/Goddard Space Flight Center Conceptual Image Lab|
During the summer melt season, melt water accumulates in undulations on the surface of the Greenland ice sheet. Eventually, these melt lakes drain through crevasses or moulins (tunnels under the ice sheet surface), delivering water to the bottom of the ice sheet. This melt water lubricates the interface between the ice and the bedrock, causing the ice to flow faster toward the sea during summer. As summer melt increases and more melt water is available, the greater its effect on summer ice sheet...
Keywords: HDTV; Where -- Greenland
|August 1, 2008 Total Solar Eclipse Umbral and Pemumbral Paths - NASA/Goddard Space Flight Center Conceptual Image Lab|
On Friday, August 1, 2008, a total eclipse of the Sun is visible from within a narrow corridor that traverses half the Earth. The path of the Moon's umbral shadow begins in Canada and extends across northern Greenland, the Artic, central Russia, Mongolia and China. A partial eclipse is seen within the much broader path of the Moon's penumbral shadow, which includes northeastern North America, most of Europe and Asia...
Keywords: Earth, HDTV, Moon, Solar Eclipse; What -- Sun; What -- Earth; What -- Moon; Where -- Canada; Where -- Greenland; Where -- Russia; Where -- Mongolia; Where -- China
|Greenland Ice Mass Balance - NASA/Goddard Space Flight Center Conceptual Image Lab|
This cut away of the Greenland ice sheet shows the high altitude accumulation region and the low altitude ablation (melt) zones. In a warming climate, both melting around the margins and precipitation in the interior increase, causing the ice sheet to grow in the middle and shrink at the edges. Note: This animation illustrates a cutaway of the high altitude accumulation zones and low altitude melt zones...
Keywords: HDTV, Earth Science, Cryosphere, Glaciers/Ice Sheets, Glacier Mass Balance/Ice Sheet Mass Balance, Earth Science, Cryosphere, Glaciers/Ice Sheets, Ice Sheets; What -- Earth; Where -- Greenland